Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
BotTalk - Create Alexa skills and Google Assistant actions with Markup
Alexa Skill Builder by Chatamo - Build your own Alexa skills for free (no code required)!
Actions on Google - The open platform for Google Assistant
Unified Remote - Unified Remote is a software app available for iPhone, Android, and Windows Phone mobile operating systems. It's designed to turn your smartphone into a universal remote. Read more about Unified Remote.
OK Google - Explore over 150 Google Now voice commands in one place